[PATCH v2] ARM: dts: sun8i: add opp-v2 table for A33

[Icenowy Zheng]

19.12.2016, 16:54, "Chen-Yu Tsai" <wens at csie.org>:
> On Mon, Dec 19, 2016 at 4:46 PM, Maxime Ripard
> <maxime.ripard at free-electrons.com> wrote:
>>  On Fri, Dec 16, 2016 at 02:27:54AM +0800, Icenowy Zheng wrote:
>>>  An operating point table is needed for the cpu frequency adjusting to
>>>  work.
>>>
>>>  The operating point table is converted from the common value in
>>>  extracted script.fex from many A33 board/tablets.
>>>
>>>  Signed-off-by: Icenowy Zheng <icenowy at aosc.xyz>
>>>  ---
>>>  Changes since v1:
>>>  - Fix format problem (blank lines).
>>>  - Removed the 1.344GHz operating point, as it's overvoltage and overclocked.
>>>
>>>  This patch depends on the following patchset:
>>>
>>>  http://lists.infradead.org/pipermail/linux-arm-kernel/2016-December/473962.html
>>>
>>>  It's the v2 of the [PATCH 4/6] in this patchset.
>>>
>>>  I think this operating point table may also apply to A23, as there's no
>>>  difference except the points over 1.2GHz between A23 and A33's stock dvfs table.
>>>
>>>  But as A23 CCU may not have the necessary fixes, I won't add the table to A23
>>>  now.
>>>
>>>  Chen-Yu, could you test the CCU fixes I described in the patchset above on A23,
>>>  then test this operating points table?
>>>
>>>  If it's necessary, you can send out the CCU fixes and add one more patch that
>>>  moves this opp-v2 table to sun8i-a23-a33.dtsi .
>>>
>>>   arch/arm/boot/dts/sun8i-a33.dtsi | 35 +++++++++++++++++++++++++++++++++++
>>>   1 file changed, 35 insertions(+)
>>>
>>>  diff --git a/arch/arm/boot/dts/sun8i-a33.dtsi b/arch/arm/boot/dts/sun8i-a33.dtsi
>>>  index 504996cbee29..0f5b2af72981 100644
>>>  --- a/arch/arm/boot/dts/sun8i-a33.dtsi
>>>  +++ b/arch/arm/boot/dts/sun8i-a33.dtsi
>>>  @@ -46,7 +46,42 @@
>>>   #include <dt-bindings/dma/sun4i-a10.h>
>>>
>>>   / {
>>>  + cpu0_opp_table: opp_table0 {
>>>  + compatible = "operating-points-v2";
>>>  + opp-shared;
>>>  +
>>>  + opp at 648000000 {
>>>  + opp-hz = /bits/ 64 <648000000>;
>>>  + opp-microvolt = <1040000>;
>>>  + clock-latency-ns = <244144>; /* 8 32k periods */
>>>  + };
>>>  +
>>>  + opp at 816000000 {
>>>  + opp-hz = /bits/ 64 <816000000>;
>>>  + opp-microvolt = <1100000>;
>>>  + clock-latency-ns = <244144>; /* 8 32k periods */
>>>  + };
>>>  +
>>>  + opp at 1008000000 {
>>>  + opp-hz = /bits/ 64 <1008000000>;
>>>  + opp-microvolt = <1200000>;
>>>  + clock-latency-ns = <244144>; /* 8 32k periods */
>>>  + };
>>>  +
>>>  + opp at 1200000000 {
>>>  + opp-hz = /bits/ 64 <1200000000>;
>>>  + opp-microvolt = <1320000>;
>>>  + clock-latency-ns = <244144>; /* 8 32k periods */
>>>  + };
>>>  + };
>>>  +
>>>        cpus {
>>>  + cpu0: cpu at 0 {
>>
>>  There's no need to duplicate the label here. I removed it and applied.
>
> I think using the label to directly reference cpu0 would be better,
> instead of duplicating the cpu at 0 block.

After proper testing of A23 ccu, the operating points can also apply to A23.
(According to A23 devices' fex)

>
> ChenYu